Small coal mill powder concentrator rotor sealing structure

Abstract

The utility model discloses a rotor sealing structure of a small coal mill powder concentrator, which comprises an upper shell and a rotor, and a sealing structure is arranged between the upper shell and the rotor. The sealing structure comprises an upper sealing ring and a lower sealing ring, the top of the upper sealing ring is fixedly connected with the upper shell, the lower sealing ring is a red copper ring, the red copper ring is fixedly connected with the upper surface of the rotor and located on the inner side of the upper sealing ring, and a gap is formed between the outer wall of the red copper ring and the inner wall of the upper sealing ring. The sealing structure is simplified, the structure is simple, the lower sealing ring is replaced by the red copper ring, red copper has good heat conduction performance, if collision occurs between the red copper ring and the upper sealing ring (the wear-resisting plate), sparks cannot be generated, the temperature generated by friction collision can be absorbed and transmitted, local temperature rise is delayed, and the service life of the sealing ring is prolonged. The rotor sealing structure has the remarkable safety advantage when being used for a small coal mill powder concentrator rotor sealing structure.

Description

Technical Field

[0001] The utility model relates to the field of vertical mills, in particular to a rotor sealing structure of a small coal mill separator. Background Art

[0002] During the production process of the vertical mill, the ground fine powder needs to be screened by the powder classifier rotor and then discharged through the discharge port. For this purpose, a sealing structure needs to be installed in the gap between the powder classifier rotor and the upper shell to prevent the material from "short-circuiting" and affecting product quality.

[0003] like Figure 1-2 As shown, the traditional sealing structure is a double-layer labyrinth structure with a large gap (up to 10 mm or more). The double-layer labyrinth structure can compensate for the disadvantage of the large gap. The upper housing 1 is connected to the upper sealing ring 3 by bolts. The bottom of the upper sealing ring 3 is provided with a circle of grooves 301. The lower sealing ring 4 is fixedly connected to the upper surface of the rotor 2. The raised ring segment of the lower sealing ring 4 is embedded in the groove 301. The groove of the upper sealing ring 3 and the raised ring segment of the lower sealing ring 4 form a labyrinth structure. The gap between the inner wall of the groove 301 of the upper sealing ring 3 and the raised ring segment of the lower sealing ring 4 is relatively wide (up to 10 mm or more). However, the labyrinth structure also compensates for the disadvantage of the large gap. During actual use, it was found that this structure has many problems: first, the sealing structure is relatively complex and the production cost is high; second, because the labyrinth ring structures are nested with each other, and the inner wall of the upper sealing ring 3 is exposed to the place where the fine powder passes, when the fine powder after the rotor screening enters the upper shell 1, it will cause wear on the inner wall of the upper sealing ring 3. If the upper sealing ring 3 is worn, the upper sealing ring 3 needs to be replaced. However, since the upper sealing ring 3 and the lower sealing ring 4 are nested with each other, when removing the upper sealing ring 3 through the inspection door, the lower sealing ring 4 needs to be removed together, which makes disassembly more troublesome and later maintenance more difficult.

[0004] Considering that small coal mill concentrators have less rotor runout and relatively stable operation compared to large cement mills, a smaller seal ring gap can theoretically be designed. However, safety is crucial for coal mill concentrators. Long-term operation can lead to bearing wear and increased rotor runout, potentially causing friction between the seal rings, generating high temperatures and sparks that could ignite the pulverized coal and cause an explosion.

[0005] Therefore, it is necessary to provide a new rotor sealing structure for a small coal mill classifier to solve the above problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a rotor sealing structure for a small coal mill classifier in response to the deficiencies of the above-mentioned prior art. The rotor sealing structure simplifies the sealing structure and has a simple structure. The lower sealing ring is replaced with a copper ring. Copper has good thermal conductivity. If a collision occurs with the upper sealing ring (wear-resistant plate), not only will no sparks be generated, but the temperature generated by the friction collision will be absorbed and transmitted, delaying local temperature rise. It has significant safety advantages when used in the rotor sealing structure of a small coal mill classifier.

[0007] In order to achieve the above technical objectives, the technical solution adopted by the utility model is:

[0008] A small coal mill separator rotor sealing structure comprises an upper shell and a rotor, wherein a sealing structure is provided between the upper shell and the rotor;

[0009] The sealing structure includes an upper sealing ring and a lower sealing ring. The top of the upper sealing ring is fixedly connected to the upper shell body. The lower sealing ring is a copper ring, which is fixedly connected to the upper surface of the rotor. The copper ring extends into the inner side of the upper sealing ring, and there is a gap between the outer wall of the copper ring and the inner wall of the upper sealing ring.

[0010] As a further improved technical solution of the present invention, the copper ring includes multiple copper bar blocks, which are respectively connected to the upper surface of the rotor by bolts, and the multiple copper bar blocks are also spliced ​​into a circular copper ring while being connected to the upper surface of the rotor.

[0011] As a further improved technical solution of the present invention, the width of the gap between the outer wall of the copper ring and the inner wall of the upper sealing ring is 5 mm.

[0012] As a further improved technical solution of the present invention, the upper sealing ring includes a planar ring segment and a raised ring segment fixedly connected to each other, the planar ring segment is fixedly connected to the upper shell body, the copper ring extends into the inner side of the raised ring segment, and there is a gap between the outer wall of the copper ring and the inner wall of the raised ring segment.

[0013] As a further improved technical solution of the present invention, the planar ring segment of the upper sealing ring is fixedly connected to the upper shell by welding.

[0014] As a further improved technical solution of the present invention, the upper sealing ring is made of a wear-resistant plate.

[0015] The beneficial effects of the utility model are:

[0016] Compared to existing labyrinth-style rotor seals, this new design simplifies the seal structure and replaces the lower seal ring with a copper ring, bolted directly to the rotor's upper surface. Copper has excellent thermal conductivity, and if it collides with the upper seal ring, it not only does not produce sparks but also absorbs and transfers the heat generated by friction and collision, slowing localized temperature rise. This offers significant safety advantages when used in coal mill separator rotor seals.

[0017] The utility model solves the safety problem and can reduce the gap between the sealing rings to 5mm, effectively enhancing the sealing effect. Compared with the existing labyrinth structure, the improved sealing structure has a relatively simple structure of the upper and lower sealing rings, is simple to manufacture, has a low manufacturing cost, and is safe in performance. The copper ring is located on the inner side of the raised ring section of the upper sealing ring, and the inner wall of the copper ring is exposed to the place where the fine powder passes. The fine powder after the rotor screening enters the upper shell. After long-term use, the fine powder wears the copper ring, reducing the wear on the raised ring section of the upper sealing ring (the flat ring section of the upper sealing ring mainly plays the role of fixing it to the upper shell, and the wear of the flat ring section will not affect the sealing effect). The upper sealing ring will hardly wear and does not need to be replaced. Therefore, when the copper ring wears and affects the sealing effect, it is necessary to replace the copper ring. Since the copper ring is composed of multiple small copper strip blocks, the bolts for installing the copper strip blocks can be removed through the inspection door to remove the multiple copper strip blocks separately. The disassembly method is simple and easy to disassemble and maintain later. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of an existing small coal mill classifier.

[0019] Figure 2 for Figure 1 The rotor sealing structure of the existing small coal mill classifier, that is, a partial enlarged view of A.

[0020] Figure 3 This is a schematic diagram of a small coal mill classifier of the present utility model.

[0021] Figure 4 for Figure 3 The rotor sealing structure of the small coal mill classifier of the present invention, that is, a partial enlarged view of B. DETAILED DESCRIPTION

[0022] The specific embodiments of the present invention are further described below with reference to the accompanying drawings:

[0023] like Figure 3-4 As shown, a rotor sealing structure of a small coal mill separator includes an upper shell 1 and a rotor 2, and a sealing structure is provided between the upper shell 1 and the rotor 2.

[0024] The sealing structure includes an upper sealing ring 3 and a lower sealing ring 4. The top of the upper sealing ring 3 is fixedly connected to the upper shell 1. The lower sealing ring 4 is a copper ring 5. The copper ring 5 is fixedly connected to the upper surface of the rotor 2 by bolts. The copper ring 5 extends into the inner side of the upper sealing ring 3, and there is a gap between the outer wall of the copper ring 5 and the inner wall of the upper sealing ring 3.

[0025] In this embodiment, the copper ring 5 includes multiple copper bar blocks, which are connected to the upper surface of the rotor 2 by bolts respectively. The multiple copper bar blocks are connected to the upper surface of the rotor 2 and are also spliced ​​into a circular copper ring 5.

[0026] In this embodiment, the upper sealing ring 3 includes a planar ring segment 302 and a raised ring segment 303 fixedly connected to each other. The planar ring segment 302 is fixedly connected to the upper shell 1 by welding. The copper ring 5 extends into the inner side of the raised ring segment 303, and there is a gap between the outer wall of the copper ring 5 and the inner wall of the raised ring segment 303. The gap width is 5 mm.

[0027] In this embodiment, the upper sealing ring 3 is made of a wear-resistant plate, which is an alloy steel plate that has undergone a special heat treatment process.

[0028] This embodiment simplifies the sealing ring structure, and replaces the lower sealing ring 4 with a plurality of copper bars, which are directly fixed with bolts.

[0029] Red copper has good thermal conductivity. When it collides with alloy steel plates, it not only does not produce sparks, but also absorbs and transmits the temperature generated by friction and collision, delaying local temperature rise. It has significant safety advantages when used in the rotor sealing ring of coal mill separators.

[0030] This embodiment solves the safety issue by reducing the sealing ring gap to 5mm, effectively enhancing the sealing effect. Compared with the existing labyrinth structure, the improved sealing structure has a relatively simple structure for the upper and lower sealing rings, is simple to manufacture, and has safe performance. In addition, the copper ring 5 is located inside the raised ring segment 303 of the upper sealing ring 3, and the inner wall of the copper ring 5 is exposed to the area where fine powder passes. The fine powder screened by the rotor 2 enters the upper shell 1 and is discharged from the air outlet of the upper shell 1. Over long-term use, the fine powder wears the copper ring 5, reducing the wear on the raised ring segment 303 of the upper sealing ring 3 (the flat ring segment 302 of the upper sealing ring 3 mainly serves to fix it to the upper shell 1, and even if the flat ring segment 302 wears, it will not affect the sealing effect). The upper sealing ring 3 is almost never worn and does not need to be replaced. Therefore, when the copper ring 5 is worn and the sealing effect is affected, the copper ring 5 needs to be replaced. Since the copper ring 5 is composed of multiple small copper bar blocks, the bolts for installing the copper bar blocks can be removed through the inspection door to remove the multiple copper bar blocks separately. The disassembly method is simple and easy to disassemble and maintain later.

[0031] In the gap sealing structure of this embodiment, the lower sealing ring 4 is made of copper and extends into the interior of the upper sealing ring 3 . A small gap exists between the outer wall of the lower sealing ring 4 made of copper and the inner wall of the upper sealing ring 3 .

[0032] The rotor seal structure of this embodiment is used in a small coal mill separator. The small coal mill separator comprises an upper housing 1, a middle housing 6, and a lower housing, which are fixedly connected in sequence. The middle housing 6 houses a rotor 2, which is connected to a main shaft. The main shaft is connected to a transmission device located above the separator housing. The transmission device comprises an electric motor and a reducer. The electric motor drives the main shaft through the reducer, which in turn drives the rotor 2, which in turn drives the upper sealing ring 3. Both the middle housing 6 and the lower housing are provided with an access door 7.

[0033] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field fall within the protection scope of the present invention.

Claims

1. A small coal mill separator rotor sealing structure, characterized in that: It comprises an upper shell and a rotor, wherein a sealing structure is provided between the upper shell and the rotor; The sealing structure includes an upper sealing ring and a lower sealing ring. The top of the upper sealing ring is connected to the upper shell body. The lower sealing ring is a copper ring. The copper ring is connected to the upper surface of the rotor. The copper ring extends into the inner side of the upper sealing ring, and there is a gap between the outer wall of the copper ring and the inner wall of the upper sealing ring.

2. The rotor sealing structure of a small coal mill separator according to claim 1 is characterized in that: The copper ring comprises a plurality of copper strip blocks, which are connected to the upper surface of the rotor by bolts respectively, and the plurality of copper strip blocks are connected to the upper surface of the rotor and are also spliced ​​into a circular copper ring.

3. The rotor sealing structure of a small coal mill separator according to claim 1 is characterized in that: The width of the gap between the outer wall of the copper ring and the inner wall of the upper sealing ring is 5 mm.

4. The rotor sealing structure of a small coal mill separator according to claim 1 is characterized in that: The upper sealing ring comprises a planar ring segment and a raised ring segment which are fixedly connected to each other. The planar ring segment is fixedly connected to the upper shell body. The copper ring extends into the inner side of the raised ring segment, and there is a gap between the outer wall of the copper ring and the inner wall of the raised ring segment.

5. The rotor sealing structure of a small coal mill separator according to claim 4 is characterized in that: The plane ring segment of the upper sealing ring is fixedly connected to the upper shell body by welding.

6. The rotor sealing structure of a small coal mill concentrator according to claim 1 is characterized in that: The upper sealing ring is made of a wear-resistant plate.

Images